What does this code do?   .model small  .386  .stack 100h  .data  msg1 db 13, 10, "Enter any number --> ", "$" msg2 db  "Enter an operation +,- * or /  --> ",13, 10, "$" msg3 db  "The Operation is --> ", "$" msg4 db  "The result is --> ", "$" by_10 dd 10   sp_counter db 0  disp_number dd 0  disp_number2 dd 0 disp_number3 dd 0 op_type db 0 last_key dd 0  remainder db 0 .code  main proc     mov ax,@data      mov ds,ax         mov dx,offset msg1     call display_message     call m_keyin          call operation     mov dx,offset msg1     call display_message     call m_keyin     cmp op_type, "+"     jnz short skip_plus     call op_plus     skiP_plus:     cmp op_type, "-"     jnz short skip_minus     call op_minus skip_minus:          cmp op_type, "*"     jnz short skip_mul     call op_mult skip_mul: cmp op_type, "/"     jnz short skip_div          call op_div skip_div:         call m_display mov ax, 4c00h  int 21h  operation proc     mov dx,offset msg2 rpt4:     call display_message     mov dx,offset msg3     call display_message     mov ah, 1     int 21h     cmp al, 30h     jns rpt4     mov op_type, al           ret operation endp m_display proc     mov dx,offset msg4     call display_message     mov eax, disp_number     mov sp_counter, 0     LP1:     mov edx, 0     div by_10     push dx     inc sp_counter     cmp eax, 0     jnz lp1 LP2:     pop dx     call display     dec sp_counter     jnz lp2     ret m_display endp op_minus proc     mov eax, disp_number2     sub eax, disp_number3     mov disp_number, eax     ret op_minus endp     op_div proc mov eax, disp_number2 div disp_number3 mov disp_number, eax mov remainder, dl call display call m_display mov dl, -16 call display mov dl, remainder call display mov dl, -1 call display mov edx, disp_number3 call display mov ax, 4c00h  int 21h  op_div endp op_mult proc     mov eax, disp_number2     mul disp_number3     mov disp_number, eax ret op_mult endp op_plus proc     mov eax, disp_number2     add eax, disp_number3     mov disp_number, eax     ret op_plus endp display proc     add dl, 30h     cmp dl, 39h     js short skip_hex     add dl, 7 Skip_hex:           mov ah, 6     int 21h     ret     display endp display_message proc     mov ah, 9      int 21h     mov edx, 0     ret display_message endp      m_keyin proc     MOV disp_number, 0     mov last_key, 0     LP_key:     mov eax, disp_number     mul by_10      add eax, last_key     mov DISP_NUMBER, eax            mov ah, 1      int 21h     AND eax, 000000ffh     cmp al, 13      jz short finkey      sub al, 30h       MOV LAST_KEY, EAX       jmp lp_key       finkey:         MOV eax, DISP_NUMBER     cmp DISP_NUMBER2,0     jnz short skip     MOV DISP_NUMBER2, EAX skip:     MOV DISP_NUMBER3, EAX     ret m_keyin endp main endp end main

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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What does this code do?

 


.model small 
.386 
.stack 100h 

.data 
msg1 db 13, 10, "Enter any number --> ", "$"
msg2 db  "Enter an operation +,- * or /  --> ",13, 10, "$"
msg3 db  "The Operation is --> ", "$"
msg4 db  "The result is --> ", "$"
by_10 dd 10  
sp_counter db 0 
disp_number dd 0 
disp_number2 dd 0
disp_number3 dd 0
op_type db 0
last_key dd 0 
remainder db 0
.code 

main proc
    mov ax,@data 
    mov ds,ax
        mov dx,offset msg1
    call display_message

    call m_keyin
    
    call operation
    mov dx,offset msg1
    call display_message

    call m_keyin
    cmp op_type, "+"
    jnz short skip_plus
    call op_plus
    skiP_plus:
    cmp op_type, "-"
    jnz short skip_minus
    call op_minus
skip_minus:
    
    cmp op_type, "*"
    jnz short skip_mul
    call op_mult
skip_mul:
cmp op_type, "/"
    jnz short skip_div
    
    call op_div
skip_div:    
    call m_display

mov ax, 4c00h 
int 21h 

operation proc
    mov dx,offset msg2
rpt4:
    call display_message
    mov dx,offset msg3
    call display_message
    mov ah, 1
    int 21h
    cmp al, 30h
    jns rpt4
    mov op_type, al
    
    
ret
operation endp

m_display proc
    mov dx,offset msg4
    call display_message
    mov eax, disp_number
    mov sp_counter, 0    

LP1:
    mov edx, 0
    div by_10
    push dx
    inc sp_counter
    cmp eax, 0
    jnz lp1

LP2:
    pop dx
    call display
    dec sp_counter
    jnz lp2
    ret
m_display endp

op_minus proc
    mov eax, disp_number2
    sub eax, disp_number3
    mov disp_number, eax
    ret
op_minus endp    
op_div proc

mov eax, disp_number2
div disp_number3
mov disp_number, eax
mov remainder, dl

call display
call m_display
mov dl, -16
call display

mov dl, remainder
call display
mov dl, -1
call display
mov edx, disp_number3

call display


mov ax, 4c00h 
int 21h 
op_div endp

op_mult proc
    mov eax, disp_number2
    mul disp_number3
    mov disp_number, eax

ret
op_mult endp
op_plus proc
    mov eax, disp_number2
    add eax, disp_number3
    mov disp_number, eax
    ret
op_plus endp
display proc
    add dl, 30h
    cmp dl, 39h
    js short skip_hex
    add dl, 7
Skip_hex:
     
    mov ah, 6
    int 21h
    ret
    display endp

display_message proc
    mov ah, 9 
    int 21h
    mov edx, 0
    ret
display_message endp
    
m_keyin proc
    MOV disp_number, 0
    mov last_key, 0
    LP_key:
    mov eax, disp_number
    mul by_10 
    add eax, last_key
    mov DISP_NUMBER, eax  
    
    mov ah, 1 
    int 21h
    AND eax, 000000ffh
    cmp al, 13 
    jz short finkey 
    sub al, 30h  
    MOV LAST_KEY, EAX  
    jmp lp_key  
    finkey:    
    MOV eax, DISP_NUMBER
    cmp DISP_NUMBER2,0
    jnz short skip
    MOV DISP_NUMBER2, EAX
skip:
    MOV DISP_NUMBER3, EAX
    ret
m_keyin endp


main endp
end main

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